Ceremony is appropriate for the audience (4)
I believe the answer is:
rite
'ceremony' is the definition.
(rite is a kind of ceremony)
'appropriate for the audience' is the wordplay.
'appropriate' becomes 'right' (similar in meaning).
'for the audience' shows a homophone (sound like) (how an audience might hear it).
'right' sounds like 'RITE'.
'is' acts as a link.
(Other definitions for rite that I've seen before include "Ceremonial act" , "Religious ceremonial sounds correct" , "something like mass" , "Custom" , "Customary observance" .)